Dumbbell



FIG. 1 shows a front perspective view of a dumbbell in accordance withthe present design;

FIG. 2 shows a front elevation view of the dumbbell of FIG. 1;

FIG. 3 shows a rear elevation view of the dumbbell of FIG. 1;

FIG. 4 shows a top view of the dumbbell of FIG. 1;

FIG. 5 shows a bottom view of the dumbbell of FIG. 1;

FIG. 6 shows a left elevation view of the dumbbell of FIG. 1; and,

FIG. 7 shows a right elevation view of the dumbbell of FIG. 1.

The broken lines illustrate portions of the dumbbell that form no partof the clamed design.

CLAIM The ornamental design for a dumbbell, as shown and described.